Burner



R. F. METCALFE.

BURNER.

APPLICAUON FILEDY JULY 25. 1919.

1,416,784, l vPatend May 23, 1922.

V its conter UNITED STATES ROBERT F. METCALFE, OF ERIE, PENNSYLVANIA.

BURNER.

Specification of Letters Patent.

Patented May 23, 1922.

Application filed .Tuly 25, 1919. Serial No. 313,422.

To all whom 'it may concern:

Be it known that l, Roi-:nar l?. Mn'roALFn, a citizen et the United States, residing at l'lrie, in the county ot lh'ie and State of lli-nmsylvania, have invented new and useilul improvements in Burners, oi" which the following is a speeilication.

This invention relates to burners and consists in certain improvements in the construction thereof as will be hereinafter fully described and pointed out in the claims, y

More iriartieularly the invention relates to that type of burners used `tor developing heat and supplied by a combustible mixture from a fuel iet. a

lin some respects the invention is an nnproveinent on the structure shown in my apgiilioation :21:59,777, tiled Aug 14, 1918.

@he inve tion is illustrated in. the acconn i'ianyiilg; drawings as follows:-u

l" l shows a plan view.

. d 2 a section on the line 2-2 in Fig. 1, a part being broken away to the line 2a--2.

Fig, 23 a section on the line 3-3 in Fig. 2.

l n trlrs the Yfurnace, 2 the liame opening to the turnace.y 3 a burner pocket in the tur nace wall. #L the burneii, the burner chainn ber.y 5 the venturi having its point or' greatest i-,ontraction at 7. 8 a tuel jet, 9 an air pipe leading' to the l'uel jet. 10 the lfuel sup ply tot.' the 'fuel jet and 11 the spari; plug iter igniting the mixture 'in the burner.

lt is desirable to have the burner provided with means whereby the pilot :flame may be maintained with very slight liow of i'uel so that the walls ot the burner may be kept at an operative temperature. This is supplied in the present instance by the pilot haine openings 'l2 in the walls of the cham,- her 5. valve 13 is arranged in the chamber immei'liately in trent ot the pilot 'Haine openings and this valve is initially closed. A spider. or web le'. couples the valve 13 with a. cylindrical valve 15 opening through I These valves are so placed that as the v 13 is opened the valve 15 closes the pilot 'Flaine openings 12.

The valves are Connected with a rod 16. This rod extends to a piston 1T arranged in the @vlinder 1S. .fi spring 19 operating a inst the piston hoids the valve 13 in an `llv clseiil position and the valve 15 initially in position to uncover the openings 12. YSin air supply pipe 20 leads to a iittlng 21 which in turn leads to the cylinder and from which are arranged the branches 22 leading to the pipes 9.

The main iame opening nozzle carrier 23 is slidingly mounted in the end of the burner chamber and the nozzle 24 itself is spaced from the walls ot the chamber so that this nozzle being as it is more or less insulated from the walls of the chamber is cooler than the walls of the chamber.

The nozzle is coupled with the valve 13 by the webs 25. Burner heating lame openings 26 are arranged in the walls of the burner between the valve 13 and the nozzle 24;. These are just suflicient in number to give sutlicient :flame to maintain the burner at the most desirable temperature 'for opera* tion. As compared with the area ot the main Haine openings the area ot the open- .ings 2G is comparativelyT small. The operation of the device is as iollows: Fuel is turned on, ignited from the spark plug 11 and burns initially within the burner to heat .it to operative temperature and then shifts to an outward iame somewhat in the inanner of the burner of my former application. lt will loe noted that as the air is turned on with more than initial volume the pressure on the piston 17 is sufficient to open the valve 13 and close the valve 15. Under these conditions there is a main liame through the opening or nozzle 24 and a minor flame through the openings 26 to keep the burner at operative temperature. lt will be understood that the tire through the openings 12 may be of any volume desired giving a small 'heat tothe furnace or Just sutlicient to maintain ignition. In any event the burner is maintained at an operative temperature.

The Venturi tube should be proportioned :in size to the air pressure used in the jet. Better results can be obtained with comparatively small Venturi tubes and moderate air pressures. ln order to get sufficient volunie ot combustible mixture to the burner the number of Venturi tubes may be in creased. l preier, therefore, to provide plurality oi Venturi tubes with fuel jets rather than to enlarge the jets and tubes for the burner.

lVhat l claim as new is zl. ln a binner, the combination ot burner chamber having a main 'Haine openino' and a ailot tlame evening the 'flame n l l v from said pilot AFlame opening` being positioned to maintain the walls ot the chamber at an operative temperature; and means for injecting a combustible mixture to the chamber.

2. In a burner7 the combination ol' a burner chamber having a main flame open ing and a pilot flame opening; the flame from said pilot flame opening being positioned to maintain the walls of/the chamber at an operative temperature; a valve between said openings; and means for actuating said valve.

3. In a burner, the combination of a burner chamber having a main flame opening1 and a pilot flame opening; a valve between said openings; means for siilpplying fluid for combustion under pressure to said burner; and devices actuated by the fluid as supplied by the burner for actuating said valve.

l. In a burner, the combination of a burner chamber having a main flame opening and a pilot flame opening; a valve between said openings; means for supplying fluid for combustion under pressure to said burner; devices actuated by the fluid as vsupplied by the burner for actuating said valve; a second valve. controlling the pilot flame opening; and means actuating said second valve.

5. In a burner, the combination of a burner chamber having a main flame opening and a pilot flame opening; a first valve between said openings; a second valve controlling the pilot flame opening; means for supplying fluid for combustion under pres sure to said burner; and devices actuated by the `fluid as supplied to the burner for actuating said valves.

6. In a burner, the combination of a burner chamber having a main flame opening and a pilot flame opening; a first valve between said openings; a-second valve controlling said pilot flame opening; means for coupling said valves together; means for supplying fluid for combustion under pressure to said burner; and devices actuated by the fluid as supplied to the burner for actuating said valves.

7. In a burner, the combination of a burner chamber having a main flame opening and a burner heating flame opening; the

inieyaa flame from the main opening being projected away from the burner walls and the flame from the burner heating flame opening being in position to heat the chamber walls; and means for supplying combustible mixture to the burner.

8. In a burner, the combination of a burner chamber having a main flame opening; a burner heating flame opening and a pilot flame opening; means for supplying combustible mixture to the burner; a valve between lhe burner heating flame opening and the pilot flame opening; and means for luftuatingg,` said valve.

9. In a `bin'nei7 the` combination of burner chamber; a plurality of flame open` ings; means within the burner for opening and closing` some of said openings; means for injecting a combustible mixture to the burner; and means for igniting the mixture in the burner; said openings being proportioned to sustain combustion within the burner initially and to transfer the fiame from the burner to without the burner as the walls of the burner chamber become heated.

l0. In a burner; the combination of a bui' ,er chamber having a main flame opening and a pilot flame opening; a main flame opening nozzle slidingly mounted in the main :flame opening; a valve coupled with said nozzle, said valve being located between `said openings; and means for actuating said valve and nozzle.

il. In a burner; the combination of a burner chamber having a main flame opening; a inixtiiu'e nozzle having its end spaced radially from and out of contact with the walls of' said ope-ning; means for heating the walls of the burner chamber; and means for injecting a combustible fluid to the ch ambe i'.

In a burner, the combination of' a burner chamber having a main flame ooenA ing; a mixture nozzle loosely mountec in the opening; and means for injecting a Combustible mixture to the chamber. Y l

In testimony vwhereof I have hereunto set my hand.

ROBERT F. lll/IETCALFE. 

